How this game ended in the manner it did beggars belief. And not only because Scotland seemed a defeated team after a frustrating first half.
Clarke's side played with much more intent than they had in Germany but lost two poor goals to trail.
First, Szymanski was not closed down quickly enough by Scott McKenna as he lined up a 30-yarder that bounced off a post and past Angus Gunn.
Scotland then looked suspect again as Zalewski drove into the box and was felled by a clumsy Anthony Ralston challenge.
Veteran Lewandowski's conversion was confident and classy as he sent Gunn the wrong way.
In between those goals, Andy Robertson's free-kick was bundled in by McTominay but the Napoli midfielder was judged by the VAR officials to have handled.
And Ryan Christie's delivery from the left found Lyndon Dykes, but his effort found the side netting, when shooting across goal may have been more profitable.
Scotland needed to respond early in the second half and respond they did. John McGinn forced the ball into a dangerous area and Christie set up Gilmour to strike.
That got the home fans back onside but hearts were in mouths when Szymanski sent another long-range effort inches wide.
McTominay continued to be Scotland's main threat and he timed his run superbly to tap home Ralston's low centre.
Roared on by the Hampden crowd, Clarke's men looked the most likely to win.
However, McGinn conceded possession in his own half in the preamble to Zalewski's run into the box and Hanley led with the wrong foot as he fouled the forward near the bye-line.
Gunn guessed correctly but could not keep the Pole's penalty out and Scotland were consigned to another defeat.